Which area of scientific investigation falls under the broad discipline of psychology?

The correct answer encompasses all the specified areas because each one represents a distinct subfield within the discipline of psychology.

Social psychology focuses on how individuals' thoughts, feelings, and behaviors are influenced by the actual, imagined, or implied presence of others. It explores phenomena such as group behavior, social perception, and interaction, illustrating how people are affected by social dynamics.

Environmental psychology examines the interplay between individuals and their surroundings, including built and natural environments. This area investigates how spaces impact behavior, mood, and well-being, as well as how humans can affect and change their environments.

Cognitive psychology delves into mental processes such as perception, memory, problem-solving, and decision-making. It considers how people think, learn, and remember, facilitating insights into various cognitive functions and disorders.

Together, these areas showcase the multifaceted nature of psychological inquiry, revealing that psychology addresses a wide range of human experiences and social phenomena. Thus, all three subfields are integral to the broader discipline, making the answer that includes all of them correct.